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1. Effect of Soil Properties on growth and Nitrogenase Activity of Exotic Associative N-fixing Bacteria | |||
Riqing Zhu,Ping Fang,Guixiao La,Yajuan Li,Songlin Gao | |||
Agronomy 28 September 2008 | |||
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Abstract:The competitive abilities of an exotic associated N-fixing bacteria strain (W12) with indigenous microbes in three soil samples were estimated using its rifampicin tolerant mutant (W12-R) based on the counts in the pure-culture and/or co-culture systems of the sterilized soil extracts. The reproduction of W12-R was significantly stressed by indigenous microbe in the co-culture systems of the all three soils, especially in the Honghe soil co-culture system due to its poor fertility. While the competitive stresses were abated at some extent after sucrose added in the co-culture systems, particularly in the Honghe soil co-culture system because of its lower indigenous microbial biomass. Furthermore, it was found that the nitrogenase activity of W12 in the co-cultured system decreased as the soil NH4+-N content or microbial biomass increased. While the nitrogenase activity of W12 was enhanced as soil TOC increased. The inoculating effects of W12 in 27 soil samples were evaluated according to the values of NAD, the difference between the nitrogenase activities detected in two soil culture systems inoculated with or without W12. Significant negative correlation between NAD and NH4+-N content (r = -0.554, P < 0.01) verified once again that higher NH4+-N content is a main nitrogenase inhibit factor in the soils. Positive inoculating effect of W12 could be obtained if soil NH4+-N content is less 10 mg kg-1, while could hardly observed when NH4+-N content exceed 60 mg kg-1. The significant negative correlations between nitrogenase activities of soil indigenous N-fixing bacteria or together with W12 and the soil Cd content were found, which implies that higher Cd content is one of the nitrogenase inhibitors to soil indigenous N-fixing microbe. | |||
TO cite this article:Riqing Zhu,Ping Fang,Guixiao La, et al. Effect of Soil Properties on growth and Nitrogenase Activity of Exotic Associative N-fixing Bacteria[OL].[28 September 2008] http://en.paper.edu.cn/en_releasepaper/content/24476 |
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